<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			#d01{
				width: 100px;
				height: 100px;
				/*background-color: #00BFFF;
				opacity: 0.3;*/
				background-color: rgba(0,0,0,.3);
			}
		</style>
	</head>
	<body>
		<div id="d01">
			
		</div>
	</body>
</html>
